单项选择题
A. A teacher. B. A director. C. An operator. D. A programmer.
A. It displays a different singing style. B. It has some distinguishing features. C. It adapts to audiences' different tastes. D. It brings out the best of the singers' voice.
A.It was for a seat in the front row. B.It could be used by two holders. C.It could be used repeatedly. D.It showed no seat number.